<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Macro BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST</title>
<link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
<link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset">
<link rel="up" href="../../boost_typeindex_header_reference.html#doxygen.boost_typeindex_header_reference.register__runtime__class_8hpp" title="Header &lt;boost/type_index/runtime_cast/register_runtime_class.hpp&gt;">
<link rel="prev" href="register__runtime__class_8hpp_1a7c9256cdd957c8893b0c997ba26825f9.html" title="Macro BOOST_TYPE_INDEX_REGISTER_RUNTIME_CLASS">
<link rel="next" href="register__runtime__class_8hpp_1a23b242cbe8011c10233940830c83dcb4.html" title="Macro BOOST_TYPE_INDEX_NO_BASE_CLASS">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%"><tr>
<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td>
<td align="center"><a href="../../../../index.html">Home</a></td>
<td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td>
<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td>
<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
<td align="center"><a href="../../../../more/index.htm">More</a></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="register__runtime__class_8hpp_1a7c9256cdd957c8893b0c997ba26825f9.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_typeindex_header_reference.html#doxygen.boost_typeindex_header_reference.register__runtime__class_8hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="register__runtime__class_8hpp_1a23b242cbe8011c10233940830c83dcb4.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a>
</div>
<div class="refentry">
<a name="doxygen.boost_typeindex_header_reference.register__runtime__class_8hpp_1a8cb786ffc23c58379c4f346b5b88d1cc"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Macro BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST</span></h2>
<p>BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST — Macro used to make a class compatible with <a class="link" href="reference__cast_8hpp_1a5e0f815ef2610b51ac34d4ffb5349d7d.html" title="Function template runtime_cast">boost::typeindex::runtime_cast</a> without including support for <a class="link" href="type__index_8hpp_1ae179d82aeceebc66d4fe38985bdb9e82.html" title="Function template type_id_runtime">boost::typeindex::type_id_runtime</a>. </p>
</div>
<h2 class="refsynopsisdiv-title">Synopsis</h2>
<div class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../boost_typeindex_header_reference.html#doxygen.boost_typeindex_header_reference.register__runtime__class_8hpp" title="Header &lt;boost/type_index/runtime_cast/register_runtime_class.hpp&gt;">boost/type_index/runtime_cast/register_runtime_class.hpp</a>&gt;

</span>BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST(...)</pre></div>
<div class="refsect1">
<a name="id-1.3.40.8.8.5.4"></a><h2>Description</h2>
<p>BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST is provided as an alternative to BOOST_TYPE_INDEX_REGISTER_RUNTIME_CLASS in the event that support for <a class="link" href="type__index_8hpp_1ae179d82aeceebc66d4fe38985bdb9e82.html" title="Function template type_id_runtime">boost::typeindex::type_id_runtime</a> is undesirable.</p>
<p><span class="bold"><strong>Example:</strong></span> </p>
<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">base1</span> <span class="special">{</span>
    <span class="identifier">BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST</span><span class="special">(</span><span class="special">)</span>
    <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">base1</span><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span>

<span class="keyword">struct</span> <span class="identifier">base2</span> <span class="special">{</span>
    <span class="identifier">BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST</span><span class="special">(</span><span class="special">)</span>
    <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">base2</span><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span>

<span class="keyword">struct</span> <span class="identifier">derived1</span> <span class="special">:</span> <span class="identifier">base1</span> <span class="special">{</span>
    <span class="identifier">BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST</span><span class="special">(</span><span class="identifier">base1</span><span class="special">)</span>
<span class="special">}</span><span class="special">;</span>

<span class="keyword">struct</span> <span class="identifier">derived2</span> <span class="special">:</span> <span class="identifier">base1</span><span class="special">,</span> <span class="identifier">base2</span> <span class="special">{</span>
    <span class="identifier">BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST</span><span class="special">(</span><span class="identifier">base1</span><span class="special">,</span> <span class="identifier">base2</span><span class="special">)</span>
<span class="special">}</span><span class="special">;</span>

<span class="special">...</span>

<span class="identifier">base1</span><span class="special">*</span> <span class="identifier">pb1</span> <span class="special">=</span> <span class="identifier">get_object</span><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">if</span><span class="special">(</span><span class="identifier">derived2</span><span class="special">*</span> <span class="identifier">pb2</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">typeindex</span><span class="special">::</span><span class="identifier">runtime_cast</span><span class="special">&lt;</span><span class="identifier">derived2</span><span class="special">*</span><span class="special">&gt;</span><span class="special">(</span><span class="identifier">pb1</span><span class="special">)</span><span class="special">)</span>
<span class="special">{</span> <span class="comment">/* can't call boost::typeindex::type_id_runtime(*pb1) here */</span> <span class="special">}</span>
</pre>
<p>
</p>
</div>
</div>
<div class="copyright-footer">Copyright © 2012-2025 Antony
      Polukhin<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
</div>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="register__runtime__class_8hpp_1a7c9256cdd957c8893b0c997ba26825f9.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_typeindex_header_reference.html#doxygen.boost_typeindex_header_reference.register__runtime__class_8hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="register__runtime__class_8hpp_1a23b242cbe8011c10233940830c83dcb4.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a>
</div>
</body>
</html>
